If you are talking about food in Thailand, just say it is yummy. You don't really want to know what's in it.
Its the roofy! Its my specialty
Ive lived long enough to know. if something is delicious, youre better of not knowing what its made of.
Tell them its the first time you've had it before, you had a recommendation for it, and that you have some minor allergies so that's why you want to know.
just be like, Can you tell me whats in this again.. I didn`t really look at it cause it`s amazing!